linux-kernel - Re: get_user_pages vs mmap MAP

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Message-ID: <464029C2.1020003@yahoo.com.au>
Date:	Tue, 08 May 2007 17:41:54 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Rusty Russell <rusty@...tcorp.com.au>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: get_user_pages vs mmap MAP_FIXED bug

Andrew Morton wrote:
> On Mon, 07 May 2007 11:26:44 +1000 Rusty Russell <rusty@...tcorp.com.au> wrote:
> 
> 
>>On Sun, 2007-05-06 at 17:01 +1000, Rusty Russell wrote:
>>
>>>This bug is in 2.6.21-rc7-mm2, but not 2.6.21.  Haven't tested
>>>2.6.21-mm1 yet.
>>
>>OK, 2.6.21-mm1 fails too.  2.6.21-git6 ... is fine.
>>
>>Here's a standalone test using ptrace.  No kernel module req'd.
>>
>>	rusty@...ussy:~/linux-2.6.21-mm1$ ../examiner 
>>	ptrace says 0, child says 0x464c457f
> 
> 
> thanks.
> 
> 
>>Any clues Andrew?  Or should I take your patches and do a binary search?
> 
> 
> I've been assuming that Nick's vm_operations.fault changes have broken
> get_user_pages()'s manual faulting.  The next step is to wait for Nick to
> turn up.

Fancy that! Thanks for catching it Rusty, does the following work for
you?

-- 
SUSE Labs, Novell Inc.

View attachment "mm-fix-for-fault.patch" of type "text/plain" (1486 bytes)